Class: Writeup::Filters::TableOfContents

Inherits:
HTML::Pipeline::Filter
  • Object
show all
Defined in:
lib/writeup/filters/table_of_contents.rb

Constant Summary collapse

PUNCTUATION_REGEXP = 
RUBY_VERSION > "1.9" ? /[^\p{Word}\- ]/u : /[^\w\- ]/

Instance Method Summary collapse

Instance Method Details

#call ⇒ Object 



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# File 'lib/writeup/filters/table_of_contents.rb', line 5

def call
  result[:toc] = ""

  headers = Hash.new(0)
  doc.css('h2, h3').each do |node|
    text = node.text
    id = text.downcase
    id.gsub!(PUNCTUATION_REGEXP, '') # remove punctuation
    id.gsub!(' ', '-') # replace spaces with dash

    uniq = (headers[id] > 0) ? "-#{headers[id]}" : ''
    headers[id] += 1
    if header_content = node.children.first
      result[:toc] << %Q{<li class="#{node.name}"><a href="##{id}#{uniq}">#{text}</a></li>\n}
      header_content.add_previous_sibling(%Q{<a id="#{id}#{uniq}" class="anchor" href="##{id}#{uniq}" aria-hidden="true"><span class="octicon octicon-link"></span></a>})
    end
  end
  result[:toc] = %Q{<ul class="section-nav">\n#{result[:toc]}</ul>} unless result[:toc].empty?
  doc
end